U.S. patent application number 16/942519 was filed with the patent office on 2021-02-11 for computer room heat-pipe air conditioning system with emergency cooling function and control and method thereof.
This patent application is currently assigned to CHANGSHA UNIVERSITY OF SCIENCE and TECHNOLOGY. The applicant listed for this patent is CHANGSHA UNIVERSITY OF SCIENCE and TECHNOLOGY. Invention is credited to Jie Li, Shuguang Liao, Xiaoqin Sun.
Application Number | 20210045265 16/942519 |
Document ID | / |
Family ID | 1000005003106 |
Filed Date | 2021-02-11 |
United States Patent
Application |
20210045265 |
Kind Code |
A1 |
Sun; Xiaoqin ; et
al. |
February 11, 2021 |
Computer room heat-pipe air conditioning system with emergency
cooling function and control and method thereof
Abstract
A computer room heat-pipe air conditioning system with an
emergency cooling control method. The system comprises a
phase-change energy storage module, a phase-change material
packaging body, a condenser housing, a condenser, a cold releasing
pump, evaporators, evaporation fans, four three-way valves, a
cooling unit, standby power generators and storage batteries. The
three-way valves are opened and closed based on a preset heat-pipe
cooling criteria in combination with phase-change energy storage
technology.
Inventors: |
Sun; Xiaoqin; (Changsha,
CN) ; Li; Jie; (Changsha, CN) ; Liao;
Shuguang; (Changsha, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHANGSHA UNIVERSITY OF SCIENCE and TECHNOLOGY |
Changsha |
|
CN |
|
|
Assignee: |
CHANGSHA UNIVERSITY OF SCIENCE and
TECHNOLOGY
Changsha
CN
|
Family ID: |
1000005003106 |
Appl. No.: |
16/942519 |
Filed: |
July 29, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H05K 7/20827 20130101;
H05K 7/20336 20130101; H05K 7/20318 20130101; H05K 7/20309
20130101; F25B 25/005 20130101 |
International
Class: |
H05K 7/20 20060101
H05K007/20; F25B 25/00 20060101 F25B025/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 8, 2019 |
CN |
CN201910728698.1 |
Claims
1. A machine room heat pipe air conditioning system with an
emergency cooling function, comprising: a refrigeration unit; a
phase change energy storage module; a phase change material
package; a condenser shell; a condenser; an evaporator; a backup
generator; and a battery; wherein the phase change material package
is located in a phase change energy storage module; the condenser
is located in a condenser shell; the condenser and the evaporator
are connected by a pipeline to form a refrigerant circulation
circuit; cold water circulation loops are formed between the
refrigeration unit and the condenser shell, between the
refrigeration unit and the phase change energy storage module, and
between the phase change energy storage module and the condenser
shell through pipelines; valves are installed on the pipelines
between the refrigeration unit and the condenser shell, between the
refrigeration unit and the phase change energy storage module, and
between the phase change energy storage module and the condenser
housing; a cooling pump is installed on the pipeline between the
phase change energy storage module and the condenser shell; an
evaporator fan is installed on the evaporator; the working power of
the refrigeration unit is provided by the city power or the backup
generator, the working power of the evaporation fan is provided by
the city power, the backup generator or the battery, the working
power of the cooling pump is provided by the city power or the
battery.
2. The heat pipe air-conditioning system for a computer room with
an emergency cooling function according to claim 1, wherein the
valve is a three-way valve, and the specific connection method is:
the first inlet and outlet of the first three-way valve are
connected to the outlet of the refrigeration unit through a
pipeline, and the second and third inlets and outlets are connected
to the phase change energy storage module and the inlet of the
condenser casing through a pipeline respectively; The first and
second inlets and outlets are connected to the outlet of the phase
change energy storage module and the condenser shell through a
pipeline, and the third inlet and outlet are connected to the inlet
of the refrigeration unit; the second inlet and outlet of the first
three-way valve is connected to the tube of the phase change energy
storage module; A second three-way valve is provided on the road;
The first and second inlets and outlets of the second three-way
valve are provided on the pipeline; The third inlet and outlet are
connected to the inlet of a cooling pump through a pipeline, and
the outlet of the cooling pump is connected through a pipeline; To
the first inlet and outlet of the third three-way valve, the second
and third inlets and outlets of the third three-way valve are
arranged on the pipeline from the third inlet and outlet of the
first three-way valve to the condenser shell.
3. The heat pipe air-conditioning system for a computer room with
an emergency cooling function according to claim 1, further
comprising a control system wherein the control system includes a
temperature sensor, a pressure sensor, and a control module; there
are three temperature sensors, which are respectively arranged in a
chilled water supply line, a return water line and an evaporator
exhaust line of a refrigeration unit; and the pressure sensor is
provided In the evaporator exhaust line; both temperature sensors
and pressure sensors are connected to the control module; and the
output end of the control module is connected to the control end of
each valve, and controls the switching of each valve and the
cooling pump according to the signals detected by the three
temperature sensors and the pressure sensors.
4. The heat pipe air-conditioning system for an equipment room with
an emergency cooling function according to claim 1, wherein the
phase-change energy storage module adopts a shell-and-tube heat
exchanger or a plate heat exchanger structure, and a plurality of
heat exchangers are provided therein. Phase-change material
packages; multiple phase-change material packages are evenly
distributed in the shell-and-tube heat exchanger or plate heat
exchanger structure; certain fluid passages are left between the
phase-change material packages; shell-and-tube heat exchangers or
plate type the structure of the heat exchanger is provided with a
fluid inlet and outlet channel for connecting the cold water
provided by the refrigeration unit or other cold sources; other
cold sources refer to all available natural cold water, such as
low-temperature lake water in summer, cooling in the transition
season and winter tower water, other cooling sources are connected
in parallel with the refrigeration unit; when the phase change
energy storage module adopts a shell and tube heat exchanger
structure, the phase change material package adopts a spherical
shape; when the phase change energy storage module adopts a plate
heat exchanger structure, the phase change material package adopts
a flat plate type.
5. The heat pipe air-conditioning system for an engine room with an
emergency cooling function according to claim 1, wherein the
condenser shell adopts a shell and tube heat exchanger or a plate
heat exchanger structure; and a shell and tube heat exchanger or a
plate heat exchanger The heat exchanger structure has a fluid inlet
and outlet passage reserved for connection with cold water provided
by a refrigeration unit or other cold sources.
6. The heat pipe air-conditioning system for an equipment room with
an emergency cooling function according to claim 1, wherein the
evaporator is arranged at a heating end of a communication device,
and uses an end-to-column air-conditioning end, a back-board
air-conditioning end, or a chip-level cooling end layout form.
7. A control method for a computer room heat pipe air conditioning
system with an emergency cooling function, characterized in that
the computer room heat pipe air conditioning system with an
emergency cooling function is the one with an emergency cooling
function according to claim 1, the control method of the heat pipe
air-conditioning system in the computer room comprising the actions
of: under normal conditions, the full load refrigeration mode being
adopted wherein the valve on the pipeline between the refrigeration
unit and the condenser shell are opened, and other valves are
closed; when the evaporator exhaust temperature is detected to
decrease, when the preset value or the exhaust pressure being
lowered to the preset value, the half-load refrigeration mode being
adopted wherein the valves on the pipeline between the
refrigeration unit and the condenser shell, and between the
refrigeration unit and the phase-change energy storage module are
opened, and the others are closed valve; when it is detected that
the chilled water supply temperature of the refrigeration unit is
greater than a predetermined value, and the difference between the
supply and return water temperatures is less than a predetermined
value, an emergency refrigeration mode being adopted, wherein the
valve on the pipeline between the phase change energy storage
module and the condenser shell and the cooling pump is opened,
other valves are closed, and the power of evaporation fan and
cooling pump is switched to battery.
8. The method for controlling a heat pipe air-conditioning system
for a computer room with an emergency cooling function of claim 7,
comprising the actions of: when it is detected that the temperature
of the chilled water supply of the refrigeration unit is greater
than a predetermined value, and the difference between the
temperature of the supply and return water is less than the
predetermined value, determining whether it is due to the main
power failure or the refrigeration unit failure; and if it is due
to the mains power failure, starting a standby generator and
switching the power of the refrigeration unit the standby
generator; waiting after the standby generator powers the
refrigeration unit to work, the full load refrigeration mode is
started; if it is due to the refrigeration unit failure, issuing a
unit alarm signal.
Description
CROSS-REFERENCE
[0001] Priority is claimed from China Patent Application No.
201910728698.1 filed on Aug. 8, 2019, which is hereby incorporated
by reference.
DESCRIPTION OF RELATED ART
[0002] The invention relates to a heat pipe air conditioning system
with a room for emergency cooling and a control method thereof, and
belongs to the technical field of air conditioning engineering.
[0003] With the development of communication technology, the
feature size of communication chips has been reduced by more than
100 times in ten years, which has led to an increase in the power
of electronic component modules, and the heat flow density per unit
area has increased, and the heat dissipation problem has become an
influence. The problem of chip performance needs to be solved. As
the power density of a single cabinet increases, the rate of
temperature rise caused by cooling failure gradually increases, and
IT equipment overheats, causing server performance degradation or
hardware damage, resulting in irreparable economic losses, and even
endangering personal safety and social stability. According to
preliminary statistics, 25% of communication failures are caused by
excessive temperature in the data center caused by municipal power
outage or refrigeration equipment failure, and the cost of one
downtime is as high as 2.4 million US dollars.
[0004] Therefore, for high heat density data centers, it is
necessary to design a compact and reliable cooling technology to
ensure continuous cooling of the refrigeration system.
SUMMARY
[0005] The present invention solves the problem of temperature rise
in the data center when a municipal power failure or refrigeration
equipment fails, and proposes a heat pipe air conditioning system
with an emergency cooling function to ensure continuity of
cooling.
[0006] The technical solution provided by the present invention
is:
[0007] A room heat pipe air conditioning system with emergency
cooling function, comprising a refrigeration unit, a phase change
energy storage module, a phase change material package, a condenser
casing, a condenser, an evaporator, a backup generator and a
battery; The phase change material package is located in the phase
change energy storage module; the condenser is located in the
condenser housing; and the condenser and the evaporator are
connected by a pipeline to form a refrigerant circulation loop
(evaporator and condenser) Through the connection between the
liquid pipe and the gas pipe, the circulation of the Freon working
medium is ensured; between the refrigeration unit and the condenser
casing, between the refrigeration unit and the phase change energy
storage module, the phase change energy storage module and the
condenser a cold water circulation loop is formed between the outer
casings through pipelines.
[0008] A valve is installed between the refrigeration unit and the
condenser casing, between the refrigeration unit and the phase
change energy storage module, and between the phase change energy
storage module and the condenser casing.
[0009] The chilled water provided by the refrigeration unit can be
supplied to the phase change energy storage module and the
condenser at the same time. The circulating water volume can be
adjusted by the valve opening degree on the relevant pipeline.
[0010] A cooling pump is installed on the pipeline between the
phase change energy storage module and the condenser casing, and
the cooling pump is used to promote circulation of the cold water
working medium between the phase change energy storage module and
the condenser casing.
[0011] An evaporator fan is mounted on the evaporator.
[0012] The working energy of the refrigeration unit is provided by
the mains or backup generator. The working energy of the
evaporating fan is provided by the mains, backup generator or
battery. The working energy of the cooling pump is provided by the
mains or battery. Under normal circumstances, the refrigeration
unit, the evaporating fan and the cooling pump are all supplied
with working voltage by the mains. When the mains is out of power,
the refrigerating unit is powered by the standby generator; after
the mains fails, the standby generator drives the refrigeration
unit to work. The battery temporarily supplies power to the cooling
pump and the evaporating fan, and adopts emergency cooling
conditions; after the standby generator drives the refrigeration
unit, the backup generator supplies power to the evaporating
fan.
[0013] The equipment room heat pipe air conditioning system with
emergency cooling function controls the operating conditions in
different environments by controlling the switches of each
valve.
[0014] Further, the valve is a three-way valve, and the specific
connection method is:
[0015] The first inlet and outlet of the first three-way valve are
connected to the outlet of the refrigeration unit through a
pipeline, and the second and third inlets and outlets are
respectively connected to the inlet of the phase change energy
storage module and the condenser casing through a pipeline; the
fourth three-way The first and second inlets and outlets of the
valve are respectively connected to the outlet of the phase change
energy storage module and the condenser casing through a pipeline,
the third inlet and outlet are connected to the inlet of the
refrigeration unit; and the second inlet and outlet of the first
three-way valve are connected to the phase change energy storage A
second three-way valve is disposed on the pipeline of the module,
the first and second inlets and outlets of the second three-way
valve are disposed on the pipeline, and the third inlet and outlet
are connected to the inlet of a cooling pump through the pipeline,
and the outlet of the cooling pump passes through The line is
connected to the first inlet and outlet of the third three-way
valve, and the second and third inlets and outlets of the third
three-way valve are disposed on the third inlet and outlet of the
first three-way valve to the line of the condenser casing.
[0016] Further, the equipment room heat pipe air conditioning
system with emergency cooling function further includes a control
system.
[0017] The control system includes a temperature sensor, a pressure
sensor, and a control module; the temperature sensor has three,
respectively disposed in the chilled water supply line, the return
water line, and the evaporator exhaust line of the refrigeration
unit; The pressure sensor is disposed in the evaporator exhaust
line; the two temperature sensors and the pressure sensor are
connected to the control module.
[0018] The output of the control module is connected to the control
terminals of each valve, and the switches of each valve and the
cooling pump are controlled according to the signals detected by
the three temperature sensors and the pressure sensor.
[0019] Further, the valves are all electric valves, and
automatically switch according to the signal of the control system;
the specific control mode is: under normal circumstances, the full
load refrigeration condition is used, and the refrigeration unit
and the condenser casing are opened. The valve on the pipeline
closes the other valves; when it is detected that the evaporator
exhaust temperature is lowered to a preset value or the exhaust
pressure is lowered to a preset value, the semi-load refrigeration
condition is used to open between the refrigeration unit and the
condenser casing, and to cool The valve on the pipeline between the
unit and the phase change energy storage module closes other
valves; when it is detected that the difference between the chilled
water supply and return water temperature of the refrigeration unit
is greater than a predetermined value, the emergency refrigeration
condition is used to open the phase change energy storage module
Close the other valves with the valve on the line between the
condenser housing and the chill pump.
[0020] Further, when the valve is an electric three-way valve, the
specific control mode is: normally, the full-load refrigeration
condition is used, and the first inlet and the third inlet and
outlet of the first three-way valve are controlled to communicate
with each other. The second and third inlets and outlets of the
four-way valve are in communication, and the second and third
inlets and outlets of the third three-way valve are in
communication, that is, the pipeline between the refrigeration unit
and the condenser casing is connected, and other inlets and other
valves of the valves are closed. When it is detected that the
evaporator exhaust temperature is lowered to a preset value or the
exhaust pressure is lowered to a preset value, the first inlet and
the outlet of the first three-way valve are communicated with the
third inlet and outlet by using a half-load refrigeration
condition, and the fourth three The second and third inlets and
outlets of the valve are in communication, and the second and third
inlets and outlets of the third three-way valve are in
communication, that is, a line connecting the refrigeration unit
and the condenser casing; and the first and the first of the first
three-way valve The two inlets and outlets are connected, the first
and third inlets and outlets of the fourth three-way valve are in
communication, and the first and third inlets and outlets of the
second three-way valve are in communication, that is, the pipeline
between the refrigeration unit and the phase change energy storage
module is connected, and these are closed. Valve He enters the
entrance and exit and other valves; when it is detected that the
difference between the chilled water supply and return water
temperature of the refrigeration unit is greater than a
predetermined value, the emergency refrigeration condition is used
to control the second and third inlets and outlets of the second
valve to communicate with each other, and the first of the third
valve The first inlet and the second inlet and outlet of the fourth
valve communicate with each other, and the discharge pump is
opened, that is, the pipeline between the phase change energy
storage module and the condenser casing is closed, and other inlets
and other valves of the valves are closed.
[0021] Further, the phase change energy storage module adopts a
shell-and-tube heat exchanger or a plate heat exchanger structure,
and a plurality of phase change material packages are disposed
therein; and the plurality of phase change material packages are
uniformly distributed in the shell Tubular heat exchanger or plate
heat exchanger structure; a certain fluid passage is left between
each phase change material package; a fluid inlet and outlet
passage is reserved on the shell tube heat exchanger or the plate
heat exchanger structure for connection refrigeration Cold water
provided by the unit or other cold source; the other cold sources
refer to all available natural cold water, such as low temperature
lake water in summer, cooling tower water in transition season and
winter, and other cold sources in parallel with the refrigeration
unit.
[0022] When the phase change energy storage module adopts a
shell-and-tube heat exchanger structure, the phase change material
package adopts a spherical shape.
[0023] When the phase change energy storage module adopts a plate
heat exchanger structure, the phase change material package adopts
a flat plate type.
[0024] Further, the condenser is a water-cooled condenser, which
adopts a microchannel structure or a copper tube aluminum fin
structure.
[0025] Further, the condenser is a water-cooled condenser, which
adopts a microchannel structure or a copper tube aluminum fin
structure.
[0026] Further, the evaporator is arranged at the heating end of
the communication device, and may adopt an arrangement such as an
air-conditioning end between the columns, an air conditioner end of
the backboard or a chip-level cooling end; these arrangements are
close to the heat source, the gas transportation distance is short,
and the required wind pressure is required. Small, can
significantly reduce fan power consumption.
[0027] Further, the phase change energy storage package comprises a
phase change material, and the phase change material used is a
nano-reinforced organic material, an inorganic material or an
organic-inorganic composite material, and the phase transition
temperature is 0-50.degree. C. between.
[0028] Further, the cooling pump is a small-sized DC water pump,
and is connected to the mains power supply circuit and the battery
power supply circuit, and can be automatically switched between the
two. The mains power supply circuit includes an AC-DC power
conversion module; the mains is converted to direct current by the
AC-DC power conversion module to supply power to the cooling
pump.
[0029] The evaporator is a heat exchanger or a plurality of
parallel heat exchangers, and adopts a microchannel structure or a
copper tube aluminum fin structure.
[0030] The evaporating fan is an axial fan, and is connected to the
mains power supply circuit, the standby generator power supply
circuit and the battery power supply circuit, and can be
automatically switched between the three. The mains power supply
circuit/backup generator power supply circuit includes an AC-DC
power conversion module; the AC power output from the mains/standby
generator is converted to DC power by the AC-DC power conversion
module to supply power to the evaporating fan.
[0031] The refrigeration unit is a chilled water unit, and a
centrifugal or screw type chiller unit can be used. The
refrigeration unit is connected to the municipal power supply
circuit and the standby generator power supply circuit at the same
time, and can automatically switch between the two.
[0032] Further, the backup generator is a diesel generator, and may
be a wind generator or the like.
[0033] The present invention further provides a control method for
a heat pipe air conditioning system of a machine room with an
emergency cooling function, wherein the heat pipe air conditioner
with a room for emergency cooling is the above-mentioned heat pipe
air conditioning system with an emergency cooling function, and the
control method thereof is: Normally, the full load refrigeration
condition is used, that is, the valve on the pipeline between the
refrigeration unit and the condenser casing is opened to close
other valves; when the evaporator exhaust temperature is detected
to decrease the preset value or the exhaust pressure is lowered to
the pre-condition When setting the value, use the semi-load
refrigeration condition, that is, open the valve on the pipeline
between the refrigeration unit and the condenser casing, between
the refrigeration unit and the phase change energy storage module,
and close other valves; when detecting the chilled water of the
refrigeration unit When the water supply temperature is greater
than the predetermined value and the difference between the supply
and return water temperatures is less than the predetermined value,
the emergency cooling condition is adopted, that is, the valve on
the pipeline between the phase change energy storage module and the
condenser casing and the cooling pump are opened, and the other
valves are closed. And switch the power of the evaporating fan and
the cooling pump to a battery.
[0034] Further, when it is detected that the chilled water supply
temperature of the refrigeration unit is greater than a
predetermined value, and the difference between the supply and
return water temperatures is less than a predetermined value, it is
determined whether the mains power failure or the refrigeration
unit is faulty, and if the utility power is cut off, the standby is
started. The generator switches the power of the refrigeration unit
to the standby generator; after the standby generator drives the
refrigeration unit to work, the operating condition is switched
back to the full load refrigeration condition; if the refrigeration
unit fails, the unit alarm signal is issued.
[0035] Benefits:
[0036] Compared with the existing technology, the invention is
based on the principle of heat pipe refrigeration, supplemented by
the application of phase change energy storage technology, and
starts the standby generator and drives the refrigeration unit to
work for time during the municipal power outage, thereby ensuring
communication data. Uninterrupted transmission; time for the
storage of communication information when the refrigeration unit
fails, to ensure the safety of data communication from these two
aspects; when the cold load in the night machine room is low, the
cooling capacity provided by the refrigeration unit is stored by
the phase change energy storage module The equipment and energy can
be fully utilized. When the cold load increases during the daytime,
the phase change energy storage module releases its stored cooling
capacity, which can share the refrigeration pressure of the
refrigeration unit, thereby reducing the peak cooling capacity
provided by the refrigeration unit, that is, reducing the
refrigeration unit. Installed capacity, alleviate the peak voltage
of the mains; and store the cold during the night low valley price,
release the cold during the daytime peak price, cool the equipment
in the equipment room, can reduce the operating cost of the air
conditioning system; in addition, through the phase change The
storage and release of the cold storage capacity of the energy
storage module, the fluctuation of the cooling capacity required by
the refrigeration unit is reduced, and the refrigeration unit is
extended for life.
BRIEF DESCRIPTION OF THE DRAWINGS
[0037] FIG. 1 is a system schematic diagram of an embodiment of the
present invention.
[0038] FIG. 2 is a system schematic diagram of a full load
refrigeration condition according to an embodiment of the present
invention.
[0039] FIG. 3 is a system schematic diagram of a half load
refrigeration condition according to an embodiment of the present
invention.
[0040] FIG. 4 is a system schematic diagram of an emergency cooling
condition according to an embodiment of the present invention.
DETAILED DESCRIPTION OF SAMPLE EMBODIMENTS
[0041] In order to make the technical means, innovative features,
achievement goals and effects of the present invention easy to
understand, the working principle of the invention will be further
explained below with reference to specific illustrations.
[0042] See FIG. 1, this embodiment discloses a room heat pipe air
conditioning system with emergency cooling function, including
phase change energy storage module 1, phase change material package
2, condenser shell 3, condenser 4, and cold pump 5, evaporator 6,
evaporating fan 7, first three-way valve 8, second three-way valve
9, third three-way valve 10, fourth three-way valve 11,
refrigeration unit 12, backup generator 13, battery 14 and related
control system; the engine room heat pipe air conditioning system
with emergency cooling function regulates operation in different
environments through switches of the first three-way valve, the
second three-way valve, the third three-way valve and the fourth
three-way valve working conditions. The phase change energy storage
module 1 adopts a shell-and-tube heat exchanger or a plate heat
exchanger structure, and includes a phase change material package 2
therein. When the shell-and-tube heat exchanger structure is
adopted, the phase change material is encapsulated in a spherical
phase change material package, and each phase change material
package is uniformly distributed in the shell-and-tube heat
exchanger structure in the form of a packed bed, and each phase
change material. There is a certain fluid passage between the
packages. When the plate heat exchanger structure is adopted, the
phase change material is encapsulated in the flat phase change
material package, and the phase change material packages are
uniformly distributed in the plate heat exchanger structure, and a
certain fluid is left between the phase change material packages,
aisle. The shell-and-tube heat exchanger or the plate heat
exchanger has a fluid inlet and outlet passage reserved for
connecting the cold water provided by the refrigeration unit or
other cold source. The phase change material package 2 comprises a
phase change material, and the phase change material used is a
nano-reinforced organic material, an inorganic material or an
organic-inorganic composite material, and the phase transition
temperature is between 0 and 50.degree. C. The condenser casing 3
is packaged by a shell and tube heat exchanger or a plate heat
exchanger. The shell-and-tube heat exchanger or the plate heat
exchanger structure reserves a fluid inlet and outlet passage to
connect the cold water provided by the refrigeration unit or other
cold source. The condenser 4 is a water-cooled condenser, which
adopts a microchannel structure or a copper tube aluminum fin
structure. The chilling pump 5 is a small DC water pump that
circulates cold water between the phase change energy storage
module 1 and the condenser casing 3. The evaporator 6 is one or
more heat exchangers connected in parallel, adopting a microchannel
structure or a copper tube aluminum fin structure. The evaporating
fan 7 is an axial fan, and is connected to the municipal power
supply and the battery power supply circuit, and can be freely
switched between the two. The first three-way valve, the second
three-way valve, the third three-way valve and the fourth three-way
valve are all electric three-way valves, and automatically switch
according to the signal of the control system. The refrigeration
unit 12 is a chilled water unit, and can adopt a centrifugal or
screw type chiller unit. The refrigeration unit is connected to the
municipal power supply circuit and the standby generator power
supply circuit at the same time, and can automatically switch
between the two. The standby generator 13 is started when the
municipal power is cut off, and drives the refrigeration unit to
work; it takes a period of time to start the standby generator 13
and drive the refrigeration unit to work; during this period, the
emergency cooling condition is used, and the battery is used. 14
the power supply of the cooling pump 5 and the evaporating fan 7 is
required, and the electric quantity of the battery needs to satisfy
the sum of the electric power consumption of the cooling pump 5 and
the evaporating fan 7 during the period; after the standby
generator drives the refrigeration unit to work, the operating
condition is switched back. Full load cooling conditions, and the
power of the evaporating fan is switched to the standby generator.
Considering that in general, the backup generator 13 can be
activated within 15 minutes and the refrigeration unit is driven to
operate. Therefore, in this embodiment, the battery is set to meet
the cooling pump 5 and the evaporating fan 7 for at least 15
minutes. The sum of the electricity consumption. The control system
includes a temperature sensor, a pressure sensor and a control
module, and the temperature sensor and the pressure sensor are both
connected to the control module.
[0043] The invention can ensure the uninterrupted cooling demand in
the data center, overcomes the shortcomings of the conventional
refrigeration system that cannot be cooled in the case of a
municipal power failure or a refrigeration unit failure, and uses
the phase change energy storage module to store the refrigeration
unit during the low communication load period. The excess cooling
capacity provided is released during the peak period of the
communication load, which effectively reduces the installed
capacity of the refrigeration unit and improves the stability and
refrigeration efficiency of the refrigeration unit. The working
condition of the invention is divided into three working
conditions, namely full load refrigeration condition, half load
refrigeration condition and emergency cooling condition.
[0044] Full load refrigeration condition: Gravity heat pipe
self-circulating cooling mode, the circulating working medium
evaporates in the evaporator to absorb the heat emitted by the
communication equipment, and the liquid working medium is converted
into the gaseous working medium, and the gas state is driven by the
density difference. The working fluid rises to the condenser, and
the gaseous working medium exchanges heat with the chilled
water/cold water provided by the refrigeration unit or other cold
source in the condenser, and the gaseous working medium condenses
into a liquid working medium and returns to the evaporator under
the action of gravity. Complete refrigeration cycle. At this time,
the chilled water/cold water supplied by the refrigeration unit or
other cold source does not enter the phase change energy storage
module, and the working circuit of the chilled water is
12-8-10-4-11-12.
[0045] Semi-load refrigeration condition: the communication load is
reduced, the heat output of the communication equipment is reduced,
the exhaust temperature and exhaust pressure of the evaporator are
reduced; when the detected evaporator exhaust temperature is
lowered by 2.degree. C. or the exhaust pressure is lowered When it
is 80% of its rated pressure, the first three-way valve, the second
three-way valve and the fourth three-way valve are electrically
operated to control the flow direction of the fluid in the
three-way valve, so that the refrigeration unit or other cold
source provides the chilled water enters the phase change energy
storage module and the condenser at the same time. The phase change
material in the phase change energy storage module is solidified
from a liquid state to a solid state, and the cold water provided
by the chilled water is stored; in addition, the chilled water
provided by the refrigeration unit or other cold source is
simultaneously Enter the condenser to ensure proper circulation of
the circulating medium between the evaporator and the condenser. As
with full-load refrigeration, the refrigerant cycle fluid
circulates between the evaporator and the condenser, and the
refrigeration is achieved by the evaporation and condensation
process of the working fluid. However, the working circuit of the
chilled water is two parallel loops, which are 12-8-9-1-11-12 and
12-8-10-3-11-12 respectively.
[0046] Emergency cooling condition: When the municipal power
failure or the refrigeration unit fails, the chilled water supply
temperature of the refrigeration unit will increase, and the
difference between the supply and return water temperatures will
increase; when the chilled water supply temperature of the
refrigeration unit is detected to be greater than the predetermined
temperature When the value and the difference between the supply
and return water temperatures are less than a predetermined value,
the second three-way valve, the third three-way valve and the
fourth three-way valve are electrically operated to control the
flow direction of the fluid in the three-way valve, and start at
this time The battery supplies power to the cooling pump and the
evaporating fan, and changes the working circuit of the chilled
water to circulate the chilled water between the phase change
energy storage module and the condenser. At this time, the phase
change energy storage module acts as a cold source of the air
conditioning system to achieve condensation. The temperature of the
device is cooled, and the working circuit of the chilled water is
1-9-5-10-3-11-1.
[0047] The invention is based on the principle of heat pipe
refrigeration, supplemented by the application of phase change
energy storage technology, to ensure the uninterrupted cooling
demand in the data center, and overcome the shortcomings of the
conventional refrigeration system that cannot be cooled in the case
of municipal power failure or refrigeration unit failure. When the
municipal power is cut off, the standby generator starts and drives
the refrigeration unit to work for time, which can ensure the
uninterrupted transmission of communication data; when the
refrigeration unit fails, it will gain time for the storage of
communication information, and ensure the security of data
communication from these two aspects; When the cold load in the
night machine room is low, the phase change energy storage module
stores the cooling capacity provided by the refrigeration unit,
which can make full use of equipment and energy. When the cold load
increases during the daytime, the phase change energy storage
module releases its stored cooling capacity and can share The
cooling pressure of the refrigeration unit, thereby reducing the
peak cooling capacity provided by the refrigeration unit, that is,
reducing the installed capacity of the refrigeration unit, easing
the peak voltage for the mains; and storing the cold during the
night low valley price, releasing the cold during the daytime peak
price Quantity, cooling equipment in the equipment room, can reduce
the operating cost of the air conditioning system; in addition,
through phase change energy storage The amount of cold mass storage
and release action, the amount of cooling required volatility
refrigeration unit decreases, extend the working life of the
refrigeration unit.
* * * * *